bunnell



(No Model.)

'I. A. BUNNELL. APPARATUS FOR PURIFYING WATER.

No. 469,770; Patented Mar. 1, 1892.

I the feed-waterfor'steanr-boilers consist in thesame purpose the water is heated by means leading from the boiler to the steam-chest of To all whom it may concern:

citizen of the United States, residing at Syracarbonate of lime is decomposed into carbonbon dioxide. The sulphate of lime can be de- UNITED STATES FRANCIS A. BUNNELL, or SYRACUSE, NEW roan, nssrenon 'ro CHRISTOPHER o.- BRADLEY, AND MARY E. BUNNELL, or SAM-E PLACE.

APPARATUS FOR P URIFYING WATER.

SPECIIICATIQN,fo1ming m of Letters Patent no. 469,770, dated March 1, 1892.

Application as July 1'3. 1891.

Be it known-that-I, FRANcIs'A. BUNNELL, a

cause, in the county of Onondaga and State of New York, have invented a new and useful Improvement in Apparatus for Purifying Water, of which the following is a specification.

This invention relates 'to the removal of scale-forming impurities from feed-water in a-simple and expeditious manner,

The scale-forming impurities contained in many localities principally of bicarbonate of lime and sulphate of lime, both of which substances are held in solution. 13y heating the feed-water to a suitable temperature the biate of lime, which is insoluble, and into carcomposed by adding a precipitant-such as carbonate of sodawhcreby carbonate of lime and sulphate of soda are formed, the former being insoluble, while the latter remains in solution in the boiler and does not form scale,

In the method of purifying water described in Letters Patent No. 445,537, granted to me February 3, 1891, and in other methods for of a surface-heater, which is, supplied with exhaust-steam. This heater is expensive and its operation is not entirely satisfactory, because insome localities scale is deposited in the heaterin spite of all precautions to the contrary. The objectof .my present invention is to dispense with this heater and to heat manner.

' he accompanying drawing represents a sectional elevation of in y improved apparatus for purifying the water.. j

A representsa-stezmiiler of. anyordilun y or suitable construction.

B represents a feed-pump, b the steam-pipe the pump, and c the main pumping-cylimler, which receives the feed-water from any available source and delivers it through the pipe (I. E is the cylinder of the precipita-nt-pu mp, whichis secured to'the rear end of the main Serial No.399,269. No model.) I

precipitant-pump, secured to the piston c' of the main pumping-cylinder.

F is the-snction-pipe of the precipitantpnm p,.provided with a check-valve f, and G its delivery-pipe provided with a check-valve g.

.ll represents a tank containing a solution of carbonate of soda or of some other precipitant prepared with\ reference to'the particular kind and quality of impurities contained in the feed-water. The suction-pipe of the precipitant-pump connects with this tank, so as to take its supply therefrom. The solution v of the precipitant is so prepared that it will rpnder insoluble all the s nlphate of lime or other similar impurity which maybe contained in'the feed-water and which would not be rendered insoluble by simply heating the water. Insome localities the feed-water contains substances which act as precipitants for the sulphate of lime under theapplication of 7o heat, and'whcn' this is the case only so much of the precipitant is required to be injected into'thc teed-water as is necessary to decompose so much of the sulphate of lime as will not be decomposed by the precipitant already contained in the water. The precipitant-pun] p is so proportioned or regulated as to-inject proper quantities of the precipitant into the feed-water at suitable intervals. in the construction represented in the drawing the main 8o- ,pump is double acting and-the precipitantpnmp issingle acting, so that there is one injection of the precipitant for each double stroke of the main piston.

The delivery-pipes G and d of the precipi- S5 taut-pump and main pump connect; with the same dischargeor inlet pipe 1, which leads to the top of a filter-J of any suitable or wellknown constrnction.-

' It represents a pipe connecting the lower 9 .port-ion ot-lthe stoam-boileiuvith the disc] arge pipe 1, whereby hot water is delivered into the feed-watcrbefore it enters the filter for the purpose of heating the feed-water.

1." represents an auxiliary pump connected 5 with the hot-watcr pipe k, whereby the hot water is forced into the feednvater-discharge pipe -I. The hot water from the boiler in mingling with the feed-water charged with the pumping-cylinder c, and e the piston of the precipitant raises the temperature of the latzoo tor sufiieicntly to convert; the bicarbonate of lime into carbonate of lime and carbon dioxide,while the sulphate of lime is decomposed by the action of the carbonate of soda forming carbonate of lime and sulphate of soda. The heated feed-water passesdownwardly through the filter and the latter separates the carbonate of lime and other insoluble impurities from the feed-water. The impurities collect in the filter and are removed therefrom by washing the latter from time to time. The

purified water escapes from the bottom of the filter through an outlet-pipe l and the water-space of the steam-boiler.

Bydrawing hot water from the boiler for the purpose of heating the feed-water this hot: water is again filtered with the new feed-water in passing through the filter and still further deprived of any impurities which it may contain and which may have become insoluble after having entered the boiler, thereby effecting a more thorough separation of the impurities in the feed-waterand reducing incrustatiou in the boiler to a minimum. Furpasses to thermore, the expensive heater is dispensed the boiler into the feed-water,

time utilizedfer heating the feed-water, substantially as set forth.

3. The herein-described method of purifying feed-water for steam-boilers, which consists in injecting a precipitant into the feedwater, then heating the feed-water containing the precipitant; by injecting hot water from the boiler into the feed-water,and then passing the heated water through a filter, in which the insoluble matter is intercepted,substantially as set forth.

4. The combination, with the steam-boiler and the filter having its outlet'connected with said boiler, of a feed-pump and a precipitantpump, both discharging into the inlet of the filter, and a hot-water-supply pipe connecting the water-space of the boiler with the inlet of the filter, substantially as set forth.

5. The combination, with the steam-boiler provided with a feed-water pipe and a filter provided with an inlet-pipe and connected at its outlet with the boiler feed-pipe, of a feedwater pump and a precipitant-pump working in unison with the feed-water pump, both pumps discharging into the inlet-pipe of the filter, a hot-water pipe connecting the waterspace of the boiler with the inlet-pipe of the filter, and a pump arranged in said hot-water pipe and supplying hot water to the inlet of the filter, substantially as set forth.

Witness my hand this 3d day of July, 1801.

FRANCIS A. BUNNELL.

Witnesses:

*lnao. L. PoPP, lumen F. SA LMON. 

